package calcite;

import org.apache.calcite.jdbc.CalciteConnection;
import org.apache.calcite.rel.RelRoot;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.calcite.adapter.java.ReflectiveSchema;
import org.apache.calcite.jdbc.CalciteSchema;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.parser.SqlParseException;
import org.apache.calcite.tools.FrameworkConfig;
import org.apache.calcite.tools.Frameworks;
import org.apache.calcite.tools.Planner;
import org.apache.calcite.tools.RelConversionException;
import org.apache.calcite.tools.ValidationException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public class CalciteBigTableQueryEngine {
    public static void main(String[] args) throws SQLException,  ValidationException, RelConversionException, SqlParseException {
        // Define connection properties
        Properties info = new Properties();
        info.setProperty("model", "inline:"
                + "{\n"
                + "  version: '1.0',\n"
                + "  defaultSchema: 'mySchema',\n"
                + "   schemas: [\n"
                + "     {\n"
                + "       name: 'mySchema',\n"
                + "       tables: [\n"
                + "         {\n"
                + "           name: 'largeTable',\n"
                + "           type: 'custom',\n"
                + "           factory: 'org.apache.calcite.adapter.csv.CsvTableFactory',\n"
                + "           operand: {\n"
                + "             directory: '/path/to/csv/files'\n"
                + "           }\n"
                + "         }\n"
                + "       ]\n"
                + "     }\n"
                + "   ]\n"
                + "}");
        // Establish JDBC connection
        Connection connection = DriverManager.getConnection("jdbc:calcite:", info);
        CalciteConnection calciteConnection = connection.unwrap(CalciteConnection.class);
        SchemaPlus rootSchema = calciteConnection.getRootSchema();
        // Add reflective schema to root
        Class<?> clazz = CalciteBigTableQueryEngine.class;
       // ReflectiveSchema reflectiveSchema = new ReflectiveSchema(new CalciteSchema(rootSchema), clazz.getSimpleName());
        //rootSchema.add("mySchema", reflectiveSchema);
        // Create a Calcite planner
        FrameworkConfig config = Frameworks.newConfigBuilder().defaultSchema(rootSchema).build();
        Planner planner = Frameworks.getPlanner(config);
        // Define the query
        String query = "SELECT * FROM largeTable WHERE id > 1000";
        // Parse the query
        SqlNode parsed = planner.parse(query);
        // Validate the query
        SqlNode validated = planner.validate(parsed);
        // Convert the validated query into a relational expression
        RelRoot logicalPlan = planner.rel(validated);
        // Analyze the query plan and execute it
        // ...
        // Close the connection
        connection.close();
    }
}